Even though the muscles no longer require the extra energy they did a few seconds earlier, the body responds to strenuous exercise by continuing to take deep breaths. This is due to the body's accumulation of an oxygen deficit.
Why does a person continue to struggle to breathe after doing a lot of exercise?
Your body uses more oxygen and produces more carbon dioxide when you exercise and make your muscles work harder. Your breathing must increase from approximately 15 times per minute (or 12 liters of air) when you are resting to approximately 40–60 times per minute (or 100 liters of air) when you are exercising in order to meet this additional demand.
What is involved in repaying the oxygen debt after muscle activity?
The liver and muscles need to turn the lactic acid back into pyruvic acid after exercise. A lot of the oxygen that the body is currently taking in does the conversion rather than being used elsewhere in order to accomplish that. This is called "repaying the debt," which is why it is called "oxygen debt."
Learn more about oxygen deficit here:
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